Self-locking bolt.



W. PANSGH & 0. G. BARK.

SELF LOOKING BOLT. APPLICATION FILED APR.30, 1910.

Patented Nov. 15, 1910.

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WILLIAM 'IPANSCH AND OTTO Ga. BARK; OF CHICAGO, ILLINOIS.

. snnr-rocxme BOLT.

specification of Letters Patent. I

Patented Nov. 15, 1910.

Application tiled April 30, 1910. Serial No. 558,647.

To all whom it may concern:

Be it known that we, WILLIAM PANson and O'r'ro G. BARK, citizens of the United States, both residing at Chica o, in the county of Cook and State of Ilhnois, have invented certain new and useful Improvements in Self-Locking Bolts,

of which the following is a specification.

This invention relates to improvements in self-locking bolts to be used for various purposes and in connection with numerous kinds of structures in which, by reason of I the character of the construction or structure, the inner ends of the bolts, when used thereon, cannot be reached by means of a wrench or other means for tightening nuts thereon, and when the structure is of such a nature or construction that a screw cannot be readily and durably seated therein; as, for example, in the construction of steel cars,

- it is necessary to secure strips of molding to the corners ofthe walls and ceiling, and

other pieces or devices to the walls, wmdowthe common bolts or screws sashes and frames, as well as to the doors and frames therefor, the inner surfaces of which are made of such thin metal that they cannot be provided with adequately tapped or screw-threaded openings to furnish the desired durability for ordinary screws, and

as the walls, sashes and frames are hollow and closed, it is evident the inner ends of which may be 'passed through plain openings, cannot be 7 reached to ti simple and inexpensive ghten nuts thereon.

The prlnclpal object of the invention is to provide self-lockmg bolts which shall be in construction, strong, durable and efficient in operation, and so made that they can be readily and securely fixed in suitable openings in the parts or pieces to be connected together.

Other objects and advantages of the invention, will be disclosed in the subjoined description and explanation.

In order to enable others skilled in the art to which the invention pertains, to make and use the same, we will now proceed to describe it, referring to the accompanying drawings, in whic Figure 1, is a view partly in section and embodying the invention, showing the same extended through a suitable opening in two pieces *to be connected together, the parts of the bolt being arranged in their initial self-locking bolt positions; Fig. 2, is a similar view of like parts, showing the members of the bolt in their locked positions; Fig. 3, is an inner face view of Fig. 2; Fig. 4, is a view partly insection and partly in elevation of the members of the bolt showing them detached; Fig. 5, is an outer end view of the sleeve; and Fig. 6, is a side View thereof.

Like .numerals of reference, refer to correspondin parts throughout the different views of t e drawing.

The reference numeral 10, designates the.

bolt, which may be made of any suitable size, form and material, but is screw-threaded, and is provided at one of its ends with a head 11, having agroove 12, for the reception of a screw driver used for turning the screw when desired to cause its parts to fasten two pieces together or to be locked in a suitable o ening. Looselyfitted on the screw threaded bolt 10, is a sleeve 13, which is provided with a number of longitudinally disposed slots 14, which extend from the inner. end of the sleeve to near its outer end and produce a series of arms or strips 15, each of which is slightly inwardlybeveled at its free end as at 16, as shown in Fig. 4, of the drawing.

The outer end of the sleeve 13, is provided with two outwardly extended projections 17, which are preferably located diametrically opposite each other as shown in Fig. 5, and by preference are produced by cutting niches 18, in the outer end of the sleeve and turning one side of each of said niches outwardly as will be understood by reference to Figs. 5, and 6, of the drawing. These projections are very slight and are adapted to bite into or engage the wall of the opening in which the sleeve is inserted, yet so as to permit the outer end of the sleeve to be flush with theouter surface of the piece in which the opening is formed. Located on the inner portion of the screw threaded bolt. 10, is a nut 19, which has its portion adjacent to the sleeve 13, beveled. as at 20, and is also provided in said portion with'a rib 21, to engage one of the arms 15, of the sleeve, when screwed up against the same.

In Figs. 1, and 2, of the drawing, the bolt is. shown as-being extended through two pieces which it is desired to connect together, one of these pieces 22, may be the inner surface of the wall of a steel car, and the other iece 23, may be a strip of molding, which -1t is desired to secure to the wall of the car.

parts may be passedthrough the openings 1n the pieces to be connected together, as shown in Fig. 1, when by turning the bolt in the proper direction, the projections 17 on the sleeve, will engage the wall of the opening in the piece 23, and'hold the sleeve against rotation. As the bolt is turned further, the nut thereon, will be turned therewith and as the ribbed or roughened surface of the nut 19, engages thearms 15, of the sleeve, it, the nut,will be advanced toward the head of the bolt, thus spreading the arms 15, outwardly as shown 1n Fig. 2, of the drawing, thereby firmly securing the pieces 22, and 23, together and firmly lockaving thus fully described the invention,-

I ingHthe parts of the bolt in position.

what we claim as new and desire to secure by Letters-Patent,is-- V i In a self-locking bolt, thecombination with a screw-threaded and headed bolt, of a sleeve loosely mounted on the bolt and extended through the openingsin the pieces to s eeve having a se-' 'ries of longitudinally disposed arms. ex

be secured together, said tended at their free ends beyond the outer surface of one of the pieces tobesecured together and having on its other-end a; pe+, ripheral and outward projection to blteinto the outer surface ofthe other piece, and a nut mounted on and engaglng the inner portion of the screw-threaded bolt and havlngits portion adjacent to the free ends; of, rovidedg the arms of the sleeve beveled and r with atrib, said nut adapted to divide the armsof the sleeve and to cause themito spread outwardly against theouter surface I CHAS. Cl TILL-MAN, J. E. Hansen. 

